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Home » Aquarium Supplies  » Saltwater Supplies  » Calcium Reactors  »  AquaMaxx Star S-2 Calcium Reactor
AquaMaxx Star S-2 Calcium Reactor

AquaMaxx Star S-2 Calcium Reactor

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AquaMaxx Star S-2 Calcium Reactor Information

Product Manuals & Documentation

The all-new AquaMaxx Star S-2 combines top-quality materials, a high-efficiency pump and innovative design to deliver a superb calcium reactor. Special injection design reduces wear-and-tear and extends the life of the Italian-Made Sicce pump. Conical lid virtually eliminates all dead spots inside the reactor and recirculates unused CO2 to maximize efficiency. With a built-in a pH probe holder, you can easily keep an eye on the pH inside the calcium reactor with a pH monitor or control the CO2 with a pH controller. Not only will you be impressed by its effectiveness, you will also be impressed visually by the look and design of the AquaMaxx Star Calcium Reactor!

With the AquaMaxx Star Calcium Reactor, CO2 is injected on the outlet side of the pump. This prevents cavitation and helps to prolong the life of the pump. Outlet-injection also ensures that the flow rate inside the reactor stays constant to maximize efficiency.

CO2 recovery design re-injects excess/unused CO2. This helps to lower CO2 usage and to make sure no excess CO2 goes back to your aquarium.

Gravity Feed or Aqualifter Pump recommended for installation!

Reverse-flow design to prevent clogging and improve water circulation.

Thumbscrews allow for easy lid removal. Easy to clean and service!

Designed to be used with any calcium reactor media.

  • Overall height: 22” (not including hoses)
  • Pump: Italian-made SICCE Syncra silent 1.5
  • Reaction tube diameter: 6”
  • Chamber capacity: 5 L
  • Footprint: 12” x 11.5”
  • Capacity: up to 500 Gallons

*Late models no longer include sponges to avoid CO2 from getting trapped in the sponges. The plates have been redesigned with smaller holes so that sponges are no longer required.

Manufacturer Info

AquaMaxx is a Southern California-based aquarium supply company that entered the market in mid-2008 with a line of affordable metal halide bulbs. The brand quickly gained recognition as word spread about the high quality and low cost of their lamps. In 2009, AquaMaxx released a line of aquarium filter socks and, in early 2010, unveiled an assortment of high-performance protein skimmer accessories and upgrades.


AquaMaxx Limited Manufacturer Warranty
AquaMaxx will warrant all AquaMaxx products to be free from manufacturing defects for one year from the original purchase date when purchased through an authorized AquaMaxx retailer. This warranty does not cover any damages caused by misuse, neglect, alterations or improper handling/transport/maintenance/installation. AquaMaxx does not cover personal injury, personal loss, or other damages associated with the use of these products.

AquaMaxx Star S-2 Calcium Reactor Reviews

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Could improve on design

Reviewers Rating Below Average

Posted: 3/7/2014
2.0 5
Experience Level: Intermediate

Comments: I have had this reactor hooked up for about 8 months. The problem with the design is there is no bleed valve to extract the extra co2 in the reactor. Having too much bubbles will cause the effluent to not drip properly. Additionally having too much bubbles in the reactor makes this reactor very loud. When co2 bubbles pass through the pump it makes a loud sound. After a few months the pump starts to get very noisy. Since the pump is built into the reactor it's difficult to modify this reactor using a different pump. This is my first ca reactor so I really don't have anything to compare it with but from my experience I would not recommend this reactor.

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Reviewers Rating Excellent!

Posted: 8/14/2013 from WILLISTON, ND UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I have had a couple other calcium reactors. One got burnt up in a power surge the other one just sucked, but I got this one and wow love it. So easy to run and with a controller its a no brainer. The recycling of the excess CO2 is already cutting down on the amount I have to buy. Instruction could be better but overall awesome!

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HOB for small lip only

Reviewers Rating Great

Posted: 7/4/2013 from NORRISTOWN, PA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: I purchased this for my 75 gal because space is tight under the tank and wanted to hang from the back of my sump. Not a chance that it will fit over the euro bracing on the sump. I may try to use a dremmel to cut notches on the bracing. I have not actually used the product because i decided to buy each piece of the Ca setup as i have the money and this was the first piece. The unit does feel well made though a little difficult to take apart and reassamble.

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Very Disappointed

Reviewers Rating Unsatisfactory

Posted: 6/2/2013 from IL UNITED STATES
0.5 5
Experience Level: Expert

Comments: It has a good design and looks nice, but is built like a piece of junk. The external small clear tube coming from the pump to the bottom of the unit was not solidly glued to the main cyllinder, resulting in leaking when I tried to set it up. This should be a solid PVC piece, not some cheap ABS thin piece of plastic. It is also extremely difficult to hook up the pump. The instructions are terrible and do not tell you all the other parts of the pump that need to be screwed in, PFTE taped ETC. Not only was it leaking from the bad lower glue joint, but two parts around the pump. These have rubber gaskets but don't seem to be doing the job on their own, so I will try adding PFTE tape. I may be able to fix these problems with some PFTE tape and Weld-On 16, but I definitely wouldn't recommend these reactors to others.

0 of 15 People found this review helpful, did you? Yes No

Hidden Gem

Reviewers Rating Excellent!

Posted: 2/15/2013 from CHINO, CA UNITED STATES
5.0 5
Experience Level: Expert

Comments: This little thing is just what the doctor ordered.Pretty much set and forget since I'm using a pH controller. The build is polished, sturdy and compact. I could use it in sump but chose to hang it so I could keep the space in sump. No sound from the sicce pump at all and energy efficient. Only things I would suggest is for aquamaxx to include a check valve and a needle valve instead of the micro valve. The TLF micro valve works fine but IME they become inconsistent over time and become finecky. Holds my alk @ 3.21 meq/l (9dkh) and Ca at 460. happy buyer here!

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Great Reactor for the $

Reviewers Rating Excellent!

Posted: 1/8/2013 from WALNUT, CA UNITED STATES
4.5 5
Experience Level: Expert

Comments: The quality of the build is excellent. I have this reactor running on my SPS dominate 225g w/ 90g sump. The set up was very simple, the use of thumb screws makes adding/changing the media very easy. The bell curve top design makes excess co2 that would usually get built up in the top get recirculated into the reactor. The sicce pump is very efficient and quiet. The reactor is light weight but still very high quality. The location of the PH probe in line with the effluent is perfect. The instructions were easy to read and understand. The only reason I did not give this 5 stars was because the reactor does not come with all of the necessary items- missing a one-way valve for the co2 line (My previous PM reactor had the one way valve integrated into the bubble counter). The instructions also do not explain the best method to drain the unit for service, I had to disconnect the line from the Sicce pump and drain it into a bucket before I could remove bell-curve lid.

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Reviewers Rating Excellent!

Posted: 11/9/2012 from PORTLAND, OR UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I've had this reactor for about a month now and I really like it. It works perfectly on my 65g bowfront, and fits neatly in the sump. The quality of the build is apparent right out of the box. It is sturdy and well made.

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Awesome little thing

Reviewers Rating Excellent!

Posted: 11/1/2012 from SAN DIEGO, CA UNITED STATES
4.5 5
Experience Level: Intermediate

Comments: Got this reactor today and really like it. Had a bubble magus c120 at and almost gave up on calcium reactor after so many day tried to adjust the flow in and out and then co2 rate. Then also leak from probe port and lot of bubble on the reactor which make terrible noise. Got this, setup within 15 min and got a very stable flow rate... It only has 1 valve to adjust, the outlet valve which is very smart. also it takes very minimal space very quiet. Now all left is fine tune the flow rate. Btw within 2 min it's all clear of bubble inside the reactor. Exelent purchase, marinedepot should advertise this product more so people can have better information. My set up 50 cube with lot lot of sps and LPS.

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